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2 years ago

13

describe the general trend in electronegativity as metals in group 2 on the periodic table are concidered in order of increasing

atomic number

1 answer:

hjlf2 years ago

6 0

Answer:

Electronegativity decrease in group from top to bottom

Explanation:

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Calculate the concentration of A bottle of wine contains 12.9% ethanol by volume. The density of ethanol (CH3OH) is 0.789 g/cm e

Delicious77 [7]

Answer:

The mass percentage of the solution is 10.46%.

The molality of the solution is 2.5403 mol/kg.

Explanation:

A bottle of wine contains 12.9% ethanol by volume.

This means that in 100 mL of solution 12.9 L of alcohol is present.

Volume of alcohol = v = 12.9 L

Mass of the ethanol = m

Density of the ethanol ,d= $0.789 g/cm^3=0.789 g/mL$

$1 cm^3=1 mL$

$m=d\times v=0.798 g/ml\times 12.9 mL = 10.1781 g$

Mass of water = M

Volume of water ,V= 100 mL - 12.9 mL = 87.1 mL

Density of water = D=1.00 g/mL

$M=D\times V=1.00 g/ml\times 87.1 mL =87.1 g$

Mass percent

$(w/w)\%=\frac{m}{m+M}\times 100$

$\frac{10.1781 g}{10.1781 g+87.1 g}\times 100=10.46\%$

Molality :

$m=\frac{m}{\text{molar mass of ethanol}\times M(kg)}$

M = 87.1 g = 0.0871 kg (1 kg =1000 g)

$=\frac{10.1781 g}{46 g/mol\times 0.0871 kg}$

$m=2.5403 mol/kg$

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2 years ago

Please help me <br> Vote you brainiest but please just help

Goryan [66]

Their average speed during the trip is 53 km/ hr approximately

Explanation: The family traveled 80 km/hr for an hour and then trabeled 40 km/ hr for 2 hours. So they traveled 80 km in one hour then 80 km in the next 2 hours. Total they traveled 160 km in 3 hours.
Average speed = distance traveled/ taken time
= 160/3 = 53.33

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2 years ago

What evidence would be least likely to help scientists learn about the organisms which have lived throughout the Earth's history

VladimirAG [237]

Answer:

B: Carbon Dioxide emissions from fossil fuels

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Each element can be indentified by the number of _______ found in its nucleus, which also equals the elements _______ _______.

Monica [59]

Defination or recotubation

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2 years ago

A young deer needs cell division to grow to its full size. However, a deer's cells continue to divide through its whole life. Wh

Mumz [18]

Answer:

D :)

Explanation:

Cells die and the new cells that are being produced are replaced by new living cells. (If cell division prevented cancer, we'd all be saved by now.)

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2 years ago